Dear Ron,

What about this?

set.seed(123)
d <- 4
x1 <- sample(0:1, d, TRUE)
x2 <- sample(0:1, d, TRUE)
x1
x2
expand.grid(x1 = x1, x2 = x2)

See ?expand.grid for more information.

Best,
Jorge.-



On Sat, Aug 9, 2014 at 7:46 PM, Ron Michael <ron_michael70@yahoo.com> wrote:

> Hi,
>
> Let say I have 2 binary vectors of length 'd', therefore both these
> vectors can take only 0-1 values. Now I want to simulate all possible pairs
> of them. Theoretically there will be 4^d possible pairs.
>
> Is there any R function to directly simulate them?
>
> Thanks for your help.
>
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>

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